#include <Servo.h>

Servo servo;
const int button = 7;
int previous_state = 0;
int servo_pos = 90;
int servo_dir = 90;


void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LOW);
  servo.attach(6);
  servo.write(servo_pos);
  pinMode(button, INPUT);
  Serial.begin(9600);
}

void loop() {
  /* Serial.println("prev state");
  Serial.print(previous_state);
  Serial.println(digitalRead(button)); */
  if (digitalRead(button) == HIGH && previous_state == 0) {
    previous_state = 1;
    // Serial.println("ON");
    // checking servo rotation goal
    if (servo_pos >= 180) {
      servo_dir = -90;
    } else if (servo_pos <= 0) {
      servo_dir = 90;
    }
    servo_pos += servo_dir;
    Serial.println("Rotating...");
    servo.write(servo_pos);
    // give the servo time to rotate
    digitalWrite(LED_BUILTIN, HIGH);
    delay(2000);
    digitalWrite(LED_BUILTIN, LOW);
    Serial.println("Done!");
  } else {
    if (previous_state == 1) {
      previous_state = 0;
    }
    // Serial.println("OFF");
  }
  // Serial.println(servo_pos);

}